Environmental Impact Statement 
Executive Information System 
Environmental Impact Statements 
Emissions Inventory System 
Electronic Instrument System 
Enterprise Information System 
Electrochemical Impedance Spectroscopy 
Enterprise Information Systems 
Epidemic Intelligence Service 
Executive Information Systems 
Educational Institute Of Scotland 
Electrical Integration System 
Enhanced Imagery System 
Environmental Information System 
Experiment Initiator System 
Extended Instruction Set 
Early Intervening Services 
effluent inventory system 
electrical impedance spectroscopy 
Electron Impact Spectroscopy 
ELECTRONIC INFORMATION SERVICES 
Electronic Instruments System 
Electronics Information System 
Emergency Information System 
Employee Information System 
END INTERRUPTION SEQUENCE 
End Item Specification 
Engineering Information System 
Enterprise Information Services 
Entry Into Service